set term png

set output "timetosolve.png"
set xlabel "Number of floors"
set ylabel "Time(mins)"
set title "Time for exact solution"
plot "vi" using 1:5 w linespoints title "VI-ADD", "vic" using 1:5 w linespoints title "VI-ADD(CONC)", "spi" using 1:5 w linespoints title "SPI-ADD"